Synthesis and characterization of sulphonated PEES copolymers by NMR spectroscopy |
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Authors: | R.T.S. Muthu Lakshmi A.S. Brar |
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Affiliation: | a Centre for Polymer Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India b Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India |
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Abstract: | Two sulphonated PEES copolymers were synthesized by reacting 75 or 60 mol% silylated hydroquinone sulphonic acid and 25 or 40 mol% of hydroquinone with 4,4′-difluorodiphenyl sulphone. The number average molecular weights determined by GPC were 13.250 and 12.050 g/mol. In the FTIR spectra, in addition to the characteristic absorption bands due to aromatic skeleton, absorption bands associated with sulphonic acid groups were observed at ∼3500, 1172, 1080, 1026, and 706 cm−1. In 1H NMR, the aromatic proton resonance signals were observed between δ = 6.99 and 7.96 ppm. 13C{1H} NMR spectra of these copolymers were complex and in order to resolve this, two-dimensional (2D) NMR techniques were utilized. Heteronuclear single quantum coherence (HSQC), total correlated spectroscopy (TOCSY), and heteronuclear multiple bond correlation (HMBC) were used for assigning the structure of the copolymers. |
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Keywords: | SPEES copolymers 2D NMR Microstructure |
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